PHP随手记1--内置函数date

date_default_timezone_set — 设定用于一个脚本中所有日期时间函数的默认时区

date — 格式化一个本地时间／日期

说明：

返回将整数 timestamp 按照给定的格式字串而产生的字符串。如果没有给出时间戳则使用本地当前时间。换句话说，timestamp 是可选的，默认值为 time()。

下面表格引用自php官方手册，放在这里方便查阅：

<?php
echo date("Y-m-d H:i:s",time());
echo "<br />";
echo date("Y-m-d H:i:s",mktime(13,55,0,12,6,2017));
echo "<br />";

<meta charset="UTF-8" />
<?php
date_default_timezone_set("Asia/ShangHai");
echo "<h1>自定义一个函数，返回一个时间差（XX天XX小时XX分钟XX秒）</h1>"; function get_time_diff($time1=0,$time2=0){
if($time1==0&&$time2==0){
$diff = time();
}elseif($time1>0&&$time2==0){
$diff = $time1;
}else{
$diff = abs($time1-$time2);
} $s = $diff%60;
$i = floor($diff%3600/60);
$h = floor($diff%(3600*24)/3600);
$d = floor($diff/(3600*24)); return "<p>".$d."天".$h."小时".$i."分钟".$s."秒</p>"; }
echo date("Y-m-d H:i:s");
echo get_time_diff();
echo get_time_diff(mktime(0,0,0,1,2,1970));
echo get_time_diff(mktime(0,0,0,12,8,2017),mktime(0,0,0,12,5,2017)); echo "<h1>自定义一个函数，输出一个日历</h1>"; function calendar($time=0){
$time = $time>0?$time:time(); $days = date("t",$time); //当月的总天数 $first_day = date("w",mktime(0,0,0,date("n",$time),1,date("Y",$time))); //当月1号是星期几 $rows = ceil(($days+$first_day)/7); //日历动态部分的行数 $count = 1; $current_day = date("j",$time); //当天是几号 echo "<table border='1'>";
echo "<tr><th colspan='7'>".date("Y年m月",$time)."</th></tr>";
echo "<tr><th>日</th><th>一</th><th>二</th><th>三</th><th>四</th><th>五</th><th>六</th></tr>";
for($i=1;$i<=$rows;$i++){
echo "<tr>";
for($j=0;$j<7;$j++){ if( ($i==1&&$j<$first_day) || ($i==$rows&&$count>$days) ){
echo "<td>&nbsp;</td>";
}else{
if($count==$current_day){
echo "<td style='color:red;'>".$count."</td>";
}else{
echo "<td>".$count."</td>";
}
$count++;
} }
echo "</tr>";
}
echo "</table>";
}
calendar();
calendar(mktime(0,0,0,10,1,2008));